We're noticing a number of HTML modules on our site that have code from Pinterest or Skype. The issue goes across portals. How is this code being added and how do we stop it? The pinterest code looks like this: 

<a href="http://www.pinterest.com/pin/create/extension/" style="height: 20px; width: 40px; position: absolute; opacity: 0.85; z-index: 8675309; display: none; cursor: pointer; border: medium none; background-image: url(data:image/png;base64,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);"></a>